Arc-lamp



M. l. WOHL.

ARC LAMP.

APPLICATION FILED |AN.14.1918. 1,394,875. Patented Oct. 25, 1921.

2 SHEETS-SHEET l.

JmL/0 a, X l L i l M. J. WGHL.

ARC LAMP.

APPLICATxoN FILED 1AN.14,1918.

1,394,875, Patented Oct. 25, 1921.

P 2 SHEETS-SHEET 2.

.PATZNT QFFICE.

MAURICE J. WOHL, OF BROOKLYN NEW YORK.

ARC-LAMP.

Application filed January 14, 1918.

To ZZ irzom t may concern.'

Be it known that aumen J. lVoHL, a citizen of the United States, and resident of Brooklyn, city of New York, county of Kings, and State of New York, has invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification.

rlhis invention relates generally to arc lamps and more particularly to multiple are lamps in which a unitary mechanism is employed. to control several arcs.

The invention has for a general object to provide an improved arrangement of parts for a multiple arc lamp facilitating the direction of the light rays from the arc upwardly, and, if desired, by reason of local operating conditions, laterally.

A further object is to provide an arc lamp in which the source of light may be located at the highest possible point permitted by local conditions. Y

A further object is to provide an improved unitary control mechanism for a plurality of arcs.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, in which latter I have illustrated a preferred embodiment of my invention.

Figure l of the drawings isl a side elevation of an arc lamp embodying the invention, a portion of the casingvbeing shown in vertical section.

Fig. 2 is a similar view, taken at right angles to Fig. l, but with the casing and resistances omitted.

Fig. 3 is a horizontal section on the line 3-3 of Fig. l.

Fig. 4 is a horizontal section on the line 4-4 of Fig. l.

Fig. 5 is a horizontal section on the line 5 5 of Fig. 2. Y

Fig. 6 is a side elevation of the lamp complete with casing, diffuser and reiiector.

Fig. 7 isa detail vertical section on the line 7 7 of Fig. 4.

In the present embodiment of the invention the main frame of my improved lamp includes a series of vertically spaced horizontal disks 2, 3 and 4, the upper and intermediate ones of which, 2 and 3, are relatively close together and are rigidly secured together by the short posts 5. Rigidly fixed at their lower enflS ill .the disk '3 Deaf 01?- Specification of Letters Patent.

Patented Oct. 25, 1321.

serial No. 211,738.

posite edges thereof are a pair of posts which extend upwardly through the top disk 2 and are fixed at their upper ends to a heavy cross bar 9. On this cross bar may fixed a bracket l() carrying a porcelain spool ll adapted to be engaged by'a hook or other member whereby the lamp may be suspended.

The intermediate disk 3 and lower disk 4 are rigidly secured to one another by means of a plurality of vertical posts which eX- tcnd in pairs therebetween. In the drawings these pairs are numbered, respectively, l5, 1G, 17 and 18 (see particularly Fig. these posts having a function apart from connecting the disks 3 and 4, as will be presently set forth.

ln the present embodiment of the invention four different carbon pairs, and, consequently, four arcs, are provided, and these are controlled by a pair of solenoids, each solenoid controlling two arcs, The dierent carbon pairs are indicated generally by the numerals 20, 2l, 22 and 23, while the solenoids are numbered 24 and 25, the solenoid 24 controlling the carbon pairs 20 and 2l, and the solenoid 25 controlling the carbon pairs 22 and 23. The solenoids l have here shown as depending from the intermediate disk 3, being vheld between the upper plates30 and lowery plates 3l which are secured to rods 32 fixed at their upper ends in the disk 3. These rods extend downwardly and have cross-bars 33 iiXed to their lower ends, each of these cross bars having a dash pot 34 mounted thereon coaXially with the respective solenoids.

Resilient connections are preferably provided between the plungers 36 of the dash pots and the cores 37 of the solenoids by vertically spaced and horizontally entende ing flat springs 38 and 39 connected, re spectively, midway between their ends, to the upper ends of the plungers 36 and the lower ends of the cores 37 and secured together at their ends, as by the studs 40.

Secured to the upper ends of the cores 37 are rods 42, preferably of brass or other non-magnetic material, and which extend upwardly, through suitable openings 43 in the intermediate disk 3, into the space between the latter and the top disk 2.

The upper'ends of these rods 42 are secured to yoke-bars 44 midway between the ends of the latter, to which yoke-bars are connected theupper ends of' links'45 whose lower ends are connected to clutches 46 ot usual construction. I prefer to provide reslllient connections between the rods 42 and yoke bars 44, these connections here comprising the springs 48 and 49, similar to the springs 38 and 39, to which the rods 42 and yoke-bars 44 are respectively connected. Fixed at their lower ends to the yoke-bars 44, co-axially with the rods 42, are short steadying-rods 5() which project upward through suitable openings in the top disk 2.

In the present embodiment of my invention the clutches 46' do not directly engage upper or adjustable carbons.

the carbons of the lamp but engage instead auxiliary rods 55, which I term dummy carbons, and which are mounted at their lower ends in cross heads 57 slidable on the framerod pairs 15, 16, 17 and 18. These dummy carbons extend freely upward through the disks 2 and 3, the former of which serves as a guide therefor, and have secured to their tops the lateral arms 58 carrying at their ends carbon sockets 59 of usual construction which are adapted to receive the Secured to the top disk 2 in vertical alinement with the carbon sockets 59 are sockets 60 of usual f construction adapted to receive the lower or fixed carbons.

As will be obvious from the above description and drawings, there are a pair of yokebars 44, one connected to each solenoid, and each yoke-bar has connected thereto a pair of the clutches 46, one at each end, each clutch engaging a dummy carbon. There are thus four dummy carbons, one for each carbon pair. The carbon pairs, it will be noted, are disposed above, and radially outward of the control mechanism.

The resistances with which are lamps are provided I have shown at depending `trom the bottom disk 4, these resistances being constructed in a well known manner by winding suitable wire upon porcelain spools. i

The mechanism conta-ined below the intermediate disk 3 is preferably inclosed by a casing 66 secured in position in any Vsuitable manner. In the present instance arbolt 67 l depends from the bottom` disk centrally oit the latter and passes through aV suitable opening in the bottom of the casing and has a nut 68 screwed onfits lower end. i Y

VTo give` a proper V.diffusion of the light from the arcs 'preferably surround the'latter with ascreen 70 of light diffusing material in the formel" an inverted truncated cone, the lower end of which closely, yet freely inelo'ses the casing 66 near the top of the latter while a substantially saucer shaped reflector 71 is placed above .the lamp,the latter being conveniently hung to the reflector by a detachable hook, indicated at 72, while the screen 70 may be suspended from the reflector .by the Vchains 73. The screen 70 may be conveniently formed of woven ground glass cloth mounted on a suitable trame 79.

lith this arrangement a clear and well diffused light, free from shadows, is obtained while the relative arrangementof control mechanism, arcs and reflectors enables the source of light to be placed close to the ceiling when desired.

I have not deemed it necessary to illustrate the wiring circuits, the circuit preferably being downwardly through one pair of carbons, through the controlling solenoid therefor, through the resistance and downwardlj.'v through the other pair of carbons controlled by this solenoid, a corresponding circuit being formed in the other unit consisting of two pairs, solenoid and resistance, while the two units may be connected in series or parallel. flexible connections will lea-d to the upper carbon sockets to accommodate vertical movement of the latter.

lhat I claim is:

1. An arc lamp having a frame consisting of a pair of horizontally disposed and Vertically spaced disks, a solenoid located under and secured to the lower disk and having its core extending upward through the latter, a clutch disposed above and adjacent the lower disk, an operative connection between said clutch and the said core, a pair of rods extending rigidly downward from the lower disk, a crosshead slidable on said rods, a

dummy carbonfixed at its lower end toy said crosshead and extending upward through the said disks and being guided by the upper disk, said dummy carbon being in engagement .with the Ysaid clutch, and a pair ot carbon sockets carried respectively by the upper end of said dummy carbon and by one of said disks. -V

2. An arc lamp having a Ytrame comprising three horizontally disposed and vertically spaced disks,solenoids secured to the underside of'. the intermediate disk, a series oi rods arranged in pairs rigidly connecting Vthe lower and intermediate disks, la crosshead slidable on each pair of said rods, dummy carbons extending upwardly from said crosshead and guided by the upper disk, dash pots eachhaving its plunger connected to the lower end of a solenoid core,1clutches engaging. thef dummy carbons, yokes connecting the said clutches in pairs, said yokes being carried by the upper ends of the solenoid cores, and upper and lower carbon sockets carried Vrespectively by the upper ends ofthe dummy carbons and the frame of the arc lamp. Y

Signed at city of New York, county of Kings and State of New York, this 7 f day oli-Jan., 1918, i

vMAURICE J, WOHL.

It will be obvious that llO izo 

